Please help. My head hurts from thinking too long.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

In the experiment you asked to react hydrochloric acid and with sodium hydroxide. when measuring the volume of the reactants, which instrument would give the greatest precision.